ready := new(uint32)
	for i := 0; i < iters; i++ {
		*ready = 0
		next0 := (i & 1) == 0
		next1 := (i & 2) == 0
		runqput(p, &gs[0], next0)
		go func() {
			for atomic.Xadd(ready, 1); atomic.Load(ready) != 2; {
			}
			if runqempty(p) {
				println("next:", next0, next1)
				throw("queue is empty")
			}
			done <- true
		}()

	case token.ADD, token.SUB, token.NOT, token.XOR, token.AND, token.RANGE:
		pos, op := p.pos, p.tok
		p.next()
		x := p.parseUnaryExpr(false)
		return &ast.UnaryExpr{pos, op, p.checkExpr(x)}

	case token.ARROW:
		// channel type or receive expression
		pos := p.pos
		p.next()
		if p.tok == token.CHAN {
			p.next()
			value := p.parseType()
			return &ast.ChanType{pos, ast.RECV, value}
		}

//	(e.g., pass list via a channel over which to range).
func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exprListMode, next0 token.Pos, isIncomplete bool) {
	if len(list) == 0 {
		if isIncomplete {
			prev := p.posFor(prev0)
			next := p.posFor(next0)
			if prev.IsValid() && prev.Line == next.Line {
				p.print("/* " + filteredMsg + " */")
			} else {
				p.print(newline)

				typ = p.parseType()
			}
		}
	case token.MUL:
		star := p.pos
		p.next()
		if p.tok == token.LPAREN {
			// *(T)
			p.error(p.pos, "cannot parenthesize embedded type")
			p.next()
			typ = p.parseQualifiedIdent(nil)
			// expect closing ')' but no need to complain if missing
			if p.tok == token.RPAREN {
				p.next()
			}
		} else {
			// *T
			typ = p.parseQualifiedIdent(nil)
		}

	XXLXOR  VS32, VS32, VS32 // clear VS32 (V0)
	SLD	$56, R5, R7
	STXVL   V0, R3, R7
	RET
#else
	CMP   R5, $4
	BLT   next2
	MOVW  R0, 0(R3)
	ADD   $4, R3
	ADD   $-4, R5
next2:
	CMP   R5, $2
	BLT   next1
	MOVH  R0, 0(R3)
	ADD   $2, R3
	ADD   $-2, R5
next1:
	CMP   R5, $0
	BC    12, 2, LR      // beqlr
	MOVB  R0, 0(R3)
	RET
#endif

    while (p->next_ != this) p = p->next_;
    p->next_ = next_;
    return false;
  }

 private:
  mutable linked_ptr_internal const* next_;
};

template <typename T>
class linked_ptr {
 public:
  typedef T element_type;

  // Take over ownership of a raw pointer.  This should happen as soon as
  // possible after the object is created.
  explicit linked_ptr(T* ptr = NULL) { capture(ptr); }

	type X struct {
		c     chan error
		nextx *X
	}
	type Y struct {
		X
		nexty *Y
		p     *int
	}
	var head *Y
	for i := 0; i < 10; i++ {
		p := &Y{}
		p.c = make(chan error)
		if head != nil {
			p.nextx = &head.X
		}
		p.nexty = head
		p.p = new(int)
		*p.p = 42
		head = p
		runtime.GC()
	}
	for p := head; p != nil; p = p.nexty {
		if *p.p != 42 {

	CMP	IN_LEN, $8
	BLT	next4
	MOVD	0(MASK_PTR), R14
	MOVD	0(BLK_INP), R15
	XOR	R14, R15, R14
	MOVD	R14, 0(BLK_OUT)
	ADD	$8, R16
	ADD	$-8, IN_LEN
next4:
	CMP	IN_LEN, $4
	BLT	next2
	MOVWZ	(BLK_INP)(R16), R15
	MOVWZ	(MASK_PTR)(R16), R14
	XOR	R14, R15, R14
	MOVW	R14, (R16)(BLK_OUT)
	ADD	$4, R16
	ADD	$-4, IN_LEN
next2:
	CMP	IN_LEN, $2
	BLT	next1

David Chase <******@****.***> 1579280635 -0500

David Chase <******@****.***> 1546465969 -0500